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P0300 post intake gasket change
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Question
1998540I6SPD
Hello,
2003
5.3L
Please help! I've just completed the intake gasket swap (used the new Delco gasket). Once I buttoned everything back together, I started the car and immediately noticed the engine running extremely rough. The ECM through a P0300 1)Engine Misfire 2)Engine Misfire. I've checked, and re-checked all my connections. I even removed and re-installed the intake manifold 3 more times (once with the old gaskets just to see).
I'm at a loss, and I have a vehicle that barely wants to run.
Any advise would be appreciated.
Thank you
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